Finding the Fourth Proportional to 2,131.82, 2,941.79 and 1,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.82 : 2,941.79 = 1,187.55 : x
2. Step 2: Convert to fraction form
   2,131.82/2,941.79 = 1,187.55/x
3. Step 3: Cross multiply
   2,131.82x = 2,941.79 × 1,187.55
4. Step 4: Simplify right side
   2,131.82x = 3,493,516.78
5. Step 5: Solve for x
   x = 3,493,516.78/2,131.82
6. Step 6: Final answer
   x = 1,638.75